<template>
  <div>
    <section class="msite">

      <!--首页标题-->
      <HeaderTop :title='address.name'>
        <!--插入插槽-->
        <router-link class="header_search" slot="left" to="/search">
            <i class="iconfont icon-sousuo"></i>
        </router-link>
        <router-link class="header_login" slot="right" :to="userInfo._id ? '/userInfo':'/login'">
            <span class="header_login_text" v-if="!userInfo._id">登录|注册</span>
            <span class="header_login_text" v-else>
              <i class="iconfont icon-person"></i>
            </span>
        </router-link>
      </HeaderTop>

      <!--首页导航-->
      <nav class="msite_nav">
        <div class="swiper-container" v-if="categorys.length">
          <div class="swiper-wrapper">
            <div class="swiper-slide" v-for="(categorys,index) in categorysArr" :key="index">

              <a href="javascript:" class="link_to_food" v-for="(category,index) in categorys" :key="index">
                <div class="food_container">
                  <img :src="baseImageUrl+category.image_url">
                </div>
                <span>{{category.title}}</span>
              </a>

            </div>
          </div>
          <!-- Add Pagination -->
          <div class="swiper-pagination"></div>
        </div>
        <img src="../MSite/images/msite_back.svg" alt="back" v-else>
      </nav>

      <!--首页附近商家-->
      <div class="msite_shop_list">
        <div class="shop_header">
          <i class="iconfont icon-xuanxiang"></i>
          <span class="shop_header_title">附近商家</span>
        </div>
        <ShopList/>
      </div>
    </section>
  </div>
</template>

<script>

  import HeaderTop from "../../components/HeaderTop/HeaderTop";
  import Swiper from 'swiper'
  import 'swiper/dist/css/swiper.min.css'
  import ShopList from "../../components/ShopList/ShopList";
  import {mapState} from 'vuex'
  import BScroll from 'better-scroll'
  export default {
    name: "MSite",
    data () {
      return {
        baseImageUrl: 'https://fuss10.elemecdn.com'
      }
    },
    components: {ShopList, HeaderTop},

    computed:{
      ...mapState(['address','categorys','userInfo']),

      categorysArr () {
        const {categorys} = this
        // 准备空的2维数组
        const arr = []
        // 准备一个小数组(最大长度为8)
        let minArr = []
        // 遍历categorys
        categorys.forEach(c => {
          // 如果当前小数组已经满了, 创建一个新的
          if(minArr.length===8) {
            minArr = []
          }
          // 如果minArr是空的, 将小数组保存到大数组中
          if(minArr.length===0) {
            arr.push(minArr)
          }
          // 将当前分类保存到小数组中
          minArr.push(c)
        })

        return arr
      }

    },
    mounted() {

      this.$store.dispatch('getFoodCategorys')
      this.$store.dispatch('getShops')

    },

    watch: {
      categorys (value) {
        // 界面更新就立即创建Swiper对象
        this.$nextTick(() => {// 一旦完成界面更新, 立即调用(此条语句要写在数据更新之后)
          // 创建一个Swiper实例对象, 来实现轮播
          new Swiper('.swiper-container', {
            loop: true, // 可以循环轮播
            // 如果需要分页器
            pagination: {
              el: '.swiper-pagination',
            },
          })

          // new BScroll('.miste-content-wrapper', {
          //   click: true
          // })
        })

      }
    },
  }
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixins.styl"
  .msite //首页
    width 100%
    .msite_nav
      bottom-border-1px(#e4e4e4)
      margin-top 45px
      height 200px
      background #fff
      .swiper-container
        width 100%
        height 100%
        .swiper-wrapper
          width 100%
          height 100%
          .swiper-slide
            display flex
            justify-content center
            align-items flex-start
            flex-wrap wrap
            .link_to_food
              width 25%
              .food_container
                display block
                width 100%
                text-align center
                padding-bottom 10px
                font-size 0
                img
                  display inline-block
                  width 50px
                  height 50px
              span
                display block
                width 100%
                text-align center
                font-size 13px
                color #666
        .swiper-pagination
          > span.swiper-pagination-bullet-active
            background #02a774

</style>
